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my $error_messages = MessageLibrary->new({
  file_open_error => sub{"Couldn't open $_[0]: $!"},
  bad_token => sub{"Invalid token $_[0] encountered on line $_[1]"},
...
  starting_parse_phase => "Starting parser...",
  generating_results => sub {"Generating results for element $_[0]"},
});

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print $status_messages->undefined_msg($a_param, $another);